Suppose that you buy an exercise ball with diameter of 85cm and your brother buys an exercise ball with diameter of 65cm. What is the difference between the volume and surface area of both balls? Justify your answer and round to the nearest hundredth

the balance is found at the link

step-by-step explanation:

765238725478629038640962136509762139056074

step-by-step explanation:

64087235609746097215074621039754021037

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b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation: